Ore-stamp.



No. 888,886. PATBNTED MAY 5, 1908.

APPLICATION PILE 1111111111 7.

r mffullll i ii' gli" j; hill# No. 666,666. PATENTED MAY 5, 1906.

w. B. EASTON. 6

ORE STAMP.

'APPLICATION FILED Mu 61. 1967.

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WILLIAM B. EASTON, OF CHICAGO, ILLINOIS.

ORE-STAMP.

Specification of Letters Patent.

Patented May 5, 1908.

Application led May 31, 1907. Serial No. 376,483

1 To all whom it may concern.'

' which carries said movable stamp or die, a

driven cam for intermittentlyT raising said rod, together with themovable stamp or die, and releasing the same when in raised position, soas to permit the stamp to fall with crushing force upon the die beneath.A

It has heretofore been attempted to apply a bell crank between the stamplifting cam and the stamp rod with the idea of imparting a suddendownward impulse or kick to the stamp immediately it is released, with aview to increasing its momentum and the force of its impact when itstrikes the lower die, -or the material to be vcrushed resting thereon.So far as I am aware, however, all efforts to thus increase the impactof the movable stamp or die have been ineffectual for the reason that,with a lever cooperating with the raising cam, said cam and lever beingproperly proportioned to raise the movable stamp or die a desireddistance and also to effectively accelerate the velocity of the stamp onits down stroke, the engagement of the cam with the lever will continueduring so large a part of the down stroke, that the lever is liable notto pass out of the path of travel ofthe cam until after the stamp hasbeen brought to rest. This may happen, for example, when an excessivequantity of ore or other material to be crushed accumulates on the lowerdie, and obviously, under these conditions, the lever will either offersuch resistance to the rotation of the cam as to stop the mill, or, moreprobably, the continued rotation of the cam, will subject the mechanismto such severe stress as to cause a break down. On the other hand, ifthe lever is properly proportioned so that it will pass out of the pathof travel of the raising cam before the movable stamp or die reaches theend of its downward stroke, it is found that the relation is such thatthe acceleration of the stamp is too slight to be of any practicaleffectf]l The principal object of the present invention is to provideimproved means for increasing the impact of the stamp which will beeffective and at the same time free from either of the objectionablefeatures above enumerated.

A further object of the invention is to provide a safety device,whereby, in case of any extraordinary resistance offered to the downwardmovement of the stamp while the accelerating devices are still inengagement, one of the members will be broken in a predetermined placeand manner, which admits of being quickly and conveniently fixed orremedied by means of inexpensive duplicate parts always at hand, thusavoiding long delays and consequent large expense, due not alone to thecost of the parts to be replaced, but to the probably much greater itemof the loss of time due to the shut down of the mill, pending repairs.

Still a further object of the invention is to provide means formaintaining the accelerating lever at all times in operating positionrelatively to both the cam cooperating therewith and the tappet on thestamp carrying rod, and for insuring the engagement of said acceleratingcam and lever in the manner designed.

To effect the foregoing objects, a stamp mill of my invention consistsof the various features, combinations of features and details ofconstruction hereinafter described and claimed.

In the accompanying drawings, in which my inventionis fullyillustrated,-Figure l is a sectional elevation of a stamp mill embodyinmy invention, taken substantially on theine 1 1 of Fig. 3. Fig. 2 is aside elevation of the upper portion of my improved stamp mill. Fig. 3 isa top plan section thereof on the line 3-3 of Fig. 2. Fig. 4 is a sideelevation of the accelerating cam on an enlarged scale.

Referring now to the drawings, A designates the base of a stamp millanchored to a suitable foundation B by means of stay bolts a, C thelower die supported in fixed position upon the base A, and D the uppermovable stamp or die carried on the lower end of a rod E supported so asto be freely movable endwise in both directions in suitable bearings eon the machine frame.

F is a cam shaft journaled in suitable bearingsf on the machine frame towhich, in operation, rotation at a constant speed is imby means of abelt applied to a drivpulley F1 secured to said cam shaft and l.nnectingthe same with a source of power, not shown.

G is a Wiper cam secured to rotate with the shaft F, and I-I a collar ortappet on the rod E, the under surface of which projects into the pathof travel of the cam G, whereby said tappet, together with the rod E andmovable stamp or die D will be intermittently raised by the cam G andthen released, allowing the same to fall.

The frame of the machine comprises lateral upright members I rigidlysecured to the foundation B at their lower ends by means of tie rods iconnecting said members I with angle plates 'L1 anchored to thefoundation B by means of stay bolts i2, and transverse frame members I1.

The stamps C and D are inclosed in a suitable casing J provided with anopening through which the rock, ore, or'other material to be crushed isdelivered upon the lower, fixed stamp or die C, and with lateralopenings jl provided with suitable screens through which the crushedmaterial is carried as fast as it becomes sufficiently reduced, by meansof the usual streamv of water discharged into the casing J. This waterescapes through the screened openings jl into a trough y'2 whichsurrounds the casing J below the opening jl and is provided at its lowerside vwith a discharge spout js.

As regards the foregoing features the stamp mill may be of any desiredor approved construction and will be readily understood by those skilledin the art from an inspection of the drawings.

Obviously the crushing effect of the stamp or die D will depend upon itsweight, including the weight of associated parts,.and upon its velocitywhen it strikes. As said mov able stamp or die, however, travels only acomparatively short distance in operation and starts with a velocity ofZero, it is desirable to provide means for overcoming the inertia of theparts and imparting thereto a velocity which will render its crushingimpact effective when it strikes the material resting on the lower dieC. As herein previously stated, it has heretofore been attempted toeffect this end by means of a pivoted lever one arm of which cooperateswith the raising cam G while its free arm is adapted to impinge upon arigid shoulder of the rod which carries the movable stamp or die. Asexplained and for the reasons stated, however, this method has beenfound to be objectionable, and -in my improved stamp mill the means foraccelerating the velocity of the movable stamp or die, are as follows:Pivoted upon the machine frame in suitable positionis a bell crank leverl, said lever being preferably secured to rock with a pivot shaft 2journaled in suitable bearings 3 on the maese,e86

path of travel of a supplemental cam 6 secured to rotate with the shaftI", said cam 6 being so positioned, relatively to the cam G, that itwill contact with the arm 5 of the bell crank lever l just as ormomentarily after the cam G, having raised the tappet H and partscontrolled thereby to the limit of their up stroke, passes out ofengagement therewith, leaving the same free to descend.

The cam 6 is of the shape shown in Fig. 4 of the drawings, and itsoperative length is shorter than the operative length of the lifting camso that it will pass out of engagement with the arm 5 of the bell cranklever l when the movable stamp or die D has reached a predeterminedpoint in its down stroke, say when said stamp or die has passed throughone-third of its stroke, in which position, excepting underextraordinary circumstances, it will still be a considerable distanceabove the material resting'on the lower die C. Obviously, by varying theshape of the operative surface of the cam 6, the kick of said cam andthus the extent to which the velocity of the movable die D will beaccelerated, may be varied as desired in any given cas'e.

In order to maintain the arms 4 and 5 of the bell crank lever 1 inproper operative relation to the tappet H on the rod E and the cam 6,respectively, the arm 4 of said lever is pivotally connected to thetappet. H by means of a link 7. As shown, said link 7 is connected tothe lever arm 4 by means of a suitable stud bolt and to the tappet II bymeans of a stud or trunnion 8 on said tappet which engages a suitablebearing in said link 7. As shown, the stud or trunnion 8 is formed on aring 9 fitted to a groove 10 formed adjacent to the upper end of thetappet H. To provide for assembling said ring 9 upon said head, it ismade in sections secured together by suitable clamping bolts. Thesurface of the lever arm 4 which bears upon the tappet H is concentricwith the point of pivotal attachment of said link to said lever arm,thus providing for contact of said lever arm with said head in itsdifferent pivotal positions. In order to relieve the link 7 from allstress due to the action of the bell crank lever 1, provision is madefor slight play in the connection between the head II and lever arm 4.As shown, this is effected by making the ring or collar 9 slightlynarrower than the width of the groove 10. It is obvious that said link 7will-at all times maintain the bell crank lever l in proper operativerelation to the tappet H and also to the cam 6 to secure the designedoperation of the various parts.

To effect the object of my invention as it relates to providing a safetydevice, whereby a member of the accelerating mechanism will be broken ina predetermined place and manner, in the event that it is subjected toan excessive strain, as, should the discharge openings from the casing Jbecome clogged, resulting in the accumulation of an excessive amount ofmaterial therein, whereby the movable stamp or die D would be arrestedbefore the cam 6 passed out of engagement with the lever arm 5, whichwould result either in stopping the mill or in breaking a part, the bellcrank lever l is made in two sections, one section comprising the arm 4and the other the arm 5, said sections being secured together by meansof pins 11, one or both of said sections being mounted to turn freely onthe pivot shaft 2 when they are disconnected from each other. The pinsl1 are made strong enough to withstand the stresses to which said leveris subjected in its designed operation but are sufficiently weaker thanother parts of said lever and than the cam 6 so that they will shear offbefore either said lever or cam is subjected to a stress which wouldbreak it. One section at least of said bell crank lever being free toturn on the pivot shaft 2 when the sections of said lever aredisconnected, it is obvious that if the pins 1l are broken, the leverarm 4 will be unaffected by the movement of the lever arm 5 under theinfluence of the accelerating cam 6 and that the raising cam G and partscontrolled thereby will be free to execute their regular cycle withoutinterference. To repair the mill, in case said pins are sheared off,from any cause, it will only be necessary to drive out the broken partsof the pins and replace them with other pins, which can be done at avery slight expense, both as regards cost of material and time consumedin making the repairs.

I claim l. In a stamp mill of the type set forth, the combination of astamp rod having a single tappet thereon, a driven shaft journaled belowsaid tappet and carrying a lifting cam and an accelerating cam, theoperative length of said accelerating cam being shorter th-an that ofthe raising cam, a bell-crank lever pivoted at a point abovethe cams andhaving one arm depending into the path of the accelerating cam and itsother arm into the path of movement of the tappet, for the purpose setforth.

2. In a stamp mill of the type set forth, the combination of a stamp rodhaving a single tappet or collar, a driven shaft journaled below saidtappet and carrying a lifting cam and an accelerating cam, a bell-cranklever pivoted at a point above the cams and having one arm dependinginto alinement with the accelerating cam and its other arm extendingover upon the upper end of the tappet, and a pivotal connection betweenthis latter arm and the tappet, for the purpose set orth.

3. In a stamp mill of the type described, the combination with a stamprod and means intermittently raising and releasing said rod, of a drivenshaft carrying an accelerating cam, and a bell-crank lever coperatingwith said cam and a rigid portion of the stamp rod, the arms of saidbell-crank lever being formed of separate sections one of which sectionsis rotatable freely on its pivot when disconnected from the othersection, and shearing pins connecting the two sections of saidbell-crank lever.

4. A stamp mill comprising a stamp rod provided with a tappet, a drivenshaft carrying a raising cam and a separate accelerating cam, abell-crank lever pivoted at a point above the cams and having one of itsarms in line with the accelerating cam and its other arm extending overupon the upper side of the tappet, a link pivotally connecting thislatter arm with the tappet, the impinging face of the arm being curvedconcentrically with the pivotal connection to the link, for the purposeset forth.

In testimony, that I claim the foregoing as my invention, I affix mysignature in presence of two subscribing witnesses, this 28th day ofMay, A. D. 1907.

NV. B. EASTON.

Witnesses:

M. V. MCGRATH, M. C. VARD.

